What massage and heat actually add
Massage in a recliner sofa is usually simple vibration — small motors buzzing in the seat and backrest at a few intensity settings. Heat is a low-wattage warming element, typically in the lumbar area. Both are comfort extras rather than therapeutic features, and both draw on the same control system as the power recline. They can be pleasant, but they are not a substitute for good seat construction and a quality recline mechanism.